Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 4,825,214	$ 3,817,377
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred costs	16,900	12,900
Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	443,568	343,125
Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,132,066	1,639,992
Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,324,377	1,038,810
Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	722,322	606,014
Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	202,881	189,436
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,588,251	2,922,609
Portfolio Loans | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	301,473	215,315
Portfolio Loans | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,437,989	1,170,618
Portfolio Loans | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,055,525	845,420
Portfolio Loans | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	603,057	512,430
Portfolio Loans | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	190,207	178,826
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	14,434	17,417
PCI Loans | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	151	1,121
PCI Loans | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,828	9,776
PCI Loans | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,718	5,626
PCI Loans | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	737	894
PCI Loans | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	0	0
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,222,529	877,351
PULs | Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	141,944	126,689
PULs | Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	683,249	459,598
PULs | Real Estate | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	266,134	187,764
PULs | Commercial and financial | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	118,528	92,690
PULs | Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 12,674	$ 10,610